Re: libxml incompatibility - Mailing list pgsql-hackers

From David Lee Lambert
Subject Re: libxml incompatibility
Date
Msg-id 806a7b82-ee81-465c-ab4a-da297d465c99@r18g2000vbi.googlegroups.com
Whole thread Raw
In response to libxml incompatibility  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: libxml incompatibility  (Andrew Dunstan <andrew@dunslane.net>)
List pgsql-hackers
On 6 mar, 22:44, and...@dunslane.net (Andrew Dunstan) wrote:
> Holger Hoffstaette wrote:
> > On Fri, 06 Mar 2009 14:32:25 -0600, Kenneth Marshall wrote:
> >> On Fri, Mar 06, 2009 at 02:58:30PM -0500, Andrew Dunstan wrote:
> >>> Yes, I discovered this a few weeks ago. [...]
>
> Maybe someone can trace the libxml calls ... not sure how exactly ...
> given Alvaro's example, it doesn't seem likely to me that this is due to
> a call to xmlCleanupParser(), but maybe the perl code invokes by simply
> doing "use XML::LibXML;" calls that for some perverse reason.

I'm able to duplicate this on Postgres 8.4 (Debian Etch, XML::LibXML
from CPAN).  Here's the backtrace from the crash:

#0  0x082f3cf1 in MemoryContextAlloc ()
#1  0x082c3f8a in xml_palloc ()
#2  0xb7dfa548 in xmlInitCharEncodingHandlers () from /usr/lib/
libxml2.so.2
#3  0xb7e0195e in xmlInitParser () from /usr/lib/libxml2.so.2
#4  0xb7dff2ef in xmlCheckVersion () from /usr/lib/libxml2.so.2
#5  0xb573af2e in boot_XML__LibXML ()  from /usr/local/lib/perl/5.8.8/auto/XML/LibXML/LibXML.so
#6  0xb587981b in Perl_pp_entersub () from /usr/lib/libperl.so.5.8
#7  0xb5877f19 in Perl_runops_standard () from /usr/lib/libperl.so.5.8
#8  0xb5819b6e in Perl_magicname () from /usr/lib/libperl.so.5.8
#9  0xb581a844 in Perl_call_sv () from /usr/lib/libperl.so.5.8
...

Is it supposed to be OK to call xmlCheckVersion() more than once?

--
DLL


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